Ac loss measurement device of high-temperature superconductor

Abstract

A measuring device for measuring the alternating current (AC) loss of a high-temperature superconductor is disclosed. In accordance with an embodiment of the present invention, the device includes a pulse power supply unit, which outputs pulse power in a cycle, a lead wire, which is formed on both sides of the pulse power supply unit and applies the pulse power to a superconductor, a degaussing coil unit, which is connected to one side of the superconductor and cancels an inductive voltage, a shunt unit, which is serially connected between one side of the degaussing coil unit and one side of the pulse power supply unit, and a measurement unit, which is connected to both ends of the shunt unit and measures an electric current flowing through the superconductor.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of Korean Patent Application No. 10-2009-0104654, filed with the Korean Intellectual Property Office on Oct. 30, 2009, the disclosure of which is incorporated herein by reference in its entirety.BACKGROUND[0002]1. Technical Field[0003]The present invention is related to an AC loss measuring device for a high-temperature superconductor.[0004]2. Description of the Related Art[0005]Superconductors generally have no resistance to direct current (DC), and thus no loss. When alternating current (AC) flows in the superconductor, however, loss occurs in the superconductor if the current changes with time or the magnetic field changes with time.[0006]Measurement of the AC loss is a very important factor in determining the cooling capacity and the heat inside connections. Moreover, since the AC loss is mainly caused by the change in current and external magnetic field, an alternating current is first applied and ...

AI Technical Summary

Benefits of technology

[0009]The present invention provides an AC loss measuring device for a high-temperature superconductor that can improve a test rated current.

[0010]The present invention also provides an AC loss measuring device for a high-temperature superconductor that can provide high reliability by minimizing the effect of temperature increase in a superconductive sample while the temperature is extremely high.

[0011]Also, the present invention provides an AC loss measuring device for a high-temperature superconductor that can be small and light and shorten the time required for measurement.

Problems solved by technology

When alternating current (AC) flows in the superconductor, however, loss occurs in the superconductor if the current changes with time or the magnetic field changes with time.

In this conventional method, however, the superconductor may be damaged if an electric current of about 35 A is applied to the superconductor for tens of seconds.

Also, in the conventional AC loss measuring device for a high-temperature superconductor, the preparation for normal operations takes tens of seconds.

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